Travel time on the westbound carriageway of the M4 between Reading and Slough is estimated to be around 1 hour and 50 minutes due to a broken down vehicle.
One lane has been closed before junction 11 for the A33, Reading because of work to recover the vehicle. Severe delays are being caused up to junction 7 for Slough West and Cippenham.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.